Garmin GNS 480 Installation Manual page 105

If the exact position is not known, the GNS 480 can determine its own initial position. If it is desired to
let the GNS 480 determine its own position, do not enter the position, time and date after the CHG smart
key is pressed. Instead, use the use the large, outer knob to select the Master GPS Reset item and set it to
'Yes' using the small, inner knob. Press the MENU/ENTER key to accept the changes, and then press
the MENU/ENTER key again to acknowledge the STOP! message.
GPS acquisition may take up to 20 minutes after a Master GPS Reset is performed.
3.3.2.1.2 GPS Operation and Position
Check the GPS operation as follows:
1. Turn on the GNS 480 and allow the unit to acquire a position. All other avionics should be turned
off for this part of the test.
2. Check the position using the GPS Status page, which is shown in Figure 3-31. This page is accessed by
pressing the FN key twice, causing the SYS smart key to be displayed. The SYS smart key is then
pressed, followed by the GPS smart key, if necessary. The lat/long displayed on this page should agree
with a known reference position.
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
Figure 3-30 – GPS Information Start-up Screen
NOTE
Post-Installation Configuration & Checkout
3-31